Speedlifter Twist Pro SDS - tool-free handlebar height adjustment - with twist function / twist +/-90° - angle-adjustable stem -10 to +50° - aluminium 3D forged, black anodised - for 1 1/8" Ahead fork, handlebar clamping 31,8mm - only for steel fork steerer with 25,4mm - including reducing sleeve with stop collar for stem mounting - T11 are approved for MTB useNote: T15 are only approved for trekking use!Important: The steerer tube must be slotted, follow the assembly instructions!